Jeff Engle wrote: >ok, now that I've come to the conclusion that it's the >logic board, where to find one? and which one? I'd like >the 166mhz system bus and 2 mb level 3 cache... Check out the info here: http://www.dvwarehouse.com/Power-Mac-G4-Logic-Boards-c-245_494.html&pltid=5c607041734d180f5d4d190593ea6ea6 or, for short: http://tinyurl.com/2luemx Expect to pay at least $125 for a 166 MHz mobo. I think you'll find the L3 RAM on the processor board. (On high-level units it may even be on the CPU die.)